teach_flow = 
	[
	 {
		 tip:"选择仪器"
	 },
	 {
		 tip:"打开Ca(OH)2试剂瓶的盖子",
		 tag:[
		      TAG_BOTTLES,
		      TAG_BOTTLE1_ALL,
		      TAG_LID1
		      ]
	 },
	 {
		 tip:"将Ca(OH)2试剂瓶中溶液倒入试管中",
		 tag:[
		      TAG_BOTTLES,
		      TAG_BOTTLE1_ALL,
		      TAG_BOTTLE1
		      ]
	 },
	 {
		 tip:"用胶头滴管将Na2Co3试剂瓶中的溶液滴入装有蒸馏水的试管中",
		 tag:[
		      TAG_DROPPER,
		      TAG_DROPPER1
		      ]
	 	,action:ACTION_DO1
	 },
	 {
		 tip:"用胶头滴管将Na2Co3试剂瓶中的溶液滴入装有Ca(OH)2溶液的试管中",
		 tag:[
		      TAG_DROPPER,
		      TAG_DROPPER1
		      ]
	 	,action:ACTION_DO2
	 },
	 {
		 tip:"打开装有FeCl3溶液的试剂瓶的盖子",
		 tag:[
		      TAG_BOTTLES,
		      TAG_BOTTLE3_ALL,
		      TAG_LID3
		      ]
	 },
	 {
		 tip:"将FeCl3试剂瓶中溶液倒入试管中",
		 tag:[
		      TAG_BOTTLES,
		      TAG_BOTTLE3_ALL,
		      TAG_BOTTLE3
		      ]
	 },
	 {
		 tip:"恭喜过关",
		 over:true
	 }
	 ]